A process set defines a set of processes according to a process type .
Just like we have the distinction between block reference, block type and block set according to type, we have the distinction between process reference, process type and process set according to a type. Our recommendation is that process sets should be described with reference to a process type.
This is both a specification of a process set as part of the enclosing block and a reference to the corresponding process diagram , which defines the properties of the processes in the set.
The numbers in parentheses after the process set name specify the number of instances in the process set. As defined in above, there are initially no processes, and there is no limit on the number of instances that may be created.